Reader recommendation: The Passage of Power Monitor readers share their favorite book picks. By Mary Folsom, Kennebunkport, Me. April 12, 2013 About video ads View Caption of It took three tries and several weeks, but I finally finished The Passage of Power by Robert Caro, the fourth volume in Caro's study of Lyndon Johnson. It was worth it. It is such a huge tome, but – like the three earlier books – very revealing. Can you guess which literary work goes with each final line? Take our quiz!